In some families/communities, little boys do not get their hair cut until they are three, and then there is a gathering for cutting their hair. The haircut is called an "upsheirin" or "chalakeh." ...
When did it become popular to have a ceremony for a boys Upsherin, his first haircut when he reaches the age of three?
Why do Chernobyl* chasidim do upsherin at the beginning of the third year? * Including Trink, Skver, etc.
According to Rav Wikipedia, the upsherin is a custom that was brought from Muslims to Palestinian Jews to Tzfat Sephardim to Chasidim. Recently, I've noticed mainstream (non-charedi) Orthodox Jews ...
Upsherin is cutting a boy's hair at or about the age of three for the first time. Is there any 'Inyan (idea) of an Upsherin for girls? Why or why not?